Here's the air flow on a 235 (216, 261) with a factory oil bath air cleaner. Air comes in horizontally, makes a 90 degree turn to go verticaly down to the surface of the oil, then makes a 180 degree turn (the oil is below the carb top) and then a 90 to get over the carb throat, a 90 to go down through the carb, a 90 to go along the intake manifold, a 90 to turn into a runner, a 90 to go up to the underside of the intake valve, and finally a 90 to go out into the cylinder. I would think a custom intake that held Webers or Mikunis to make a straight shot to the intake valves would make more sense and be way more tunable. The carb on the siamesed port could be adjusted to give the same air/fuel ratio as the individual runner ports. Years ago on our sprint car the injectors could be tuned so the front to rear and right side to left side cylinders gave the same plug readings.
